SYNOPSIS

DESCRIPTION

These two methods manage a bus specific set of instance variables of a
child device. The intention is that each different type of bus defines a
set of appropriate instance variables (such as ports and irqs for ISA bus
etc.)
This information could be given to the child device as a struct but that
makes it hard for a bus to add or remove variables without forcing an
edit and recompile for all drivers which may not be possible for vendor
supplied binary drivers.

RETURNVALUES

Zero is returned on success, otherwise an appropriate error is returned.